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Old 08-08-2015, 03:45 PM
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Default How accurate is this port infornation?

So i was digging around on ports and found this in the graveyard.


Formula for finding rectangle port size?

Apparently the formula for the rectangular ports to determine tuning.

Was thinking about ideas for the death penalty 21 and thought id try something new.

Obviously im still learning the math behind the enclosure design process so i have to ask if this looks like the right idea for tuning the port?

Sorry, i stay mobile so trying to copy it isnt working too wrll. Any advice is appreciated.
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Old 08-08-2015, 09:09 PM
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Edit: I just realized i skipped an input on the driver parameters on the WinISD program. I didn't input the PE into the parameter, which is probably why it couldn't calculate haha.

My gross space is 41W x 22T x 24D for the trunk area of my jeep. All together I've got about 10 cubes Gross to work with.

Going simply by mach speed I could run a single 8" aero and mach speed of 0.10. I'm a bit concerned that it won't be nearly enough port in the real world, though I do think it would help control the sub with extending under tuning.

On the other hand, I'm also looking at a simple 8H x 8W x 21D square that comes out to 8"/cube. I know with slot you generally want more port, but what about basic square/rectangulars?

The driver in question is the IA 21" DP. Running off of a generic 2k, seeing as how I haven't decided what to run yet. I'm aiming peak tuning around 28-30 hz. The goal is to be able to play down to 20hz with no fears of melting coils or shredding spiders.

I'm starting to use WinISD as well as Bass Box Pro. I'm running this scenario through WinISD at the moment.. estimating a solid 8 cubes net by time I put in the bracing, sub, and port depending on which style of port I actually use.

I know there is a recent thread on ports but I can't seem to find it. Anyone have any advice on this scenario? I'm trying to understand what is happening here compared to asking people to do my work for me. Need some opinions please.

Last edited by southernbass; 08-08-2015 at 09:27 PM. Reason: D'oh!
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Old 08-09-2015, 02:24 AM
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Op you mention always mobile, you could use the CT app. It's slightly off sometimes from what Torres is telling me sometimes, but they're all not exactly the same. It's no more off than comparing bbp6, winisd , and Torres together

https://play.google.com/store/apps/d...om.ct.ctsounds

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Old 08-09-2015, 08:18 AM
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Thanks for the tip, i use xplicits app. 90% i am mobile, but i do find some time to get on the computer now and again.

Looks like im just gonna have to do it the old fashioned way. Guess like hell and keep building till i get it right.
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Old 08-15-2015, 11:05 PM
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Iirc it's the end correction factor. Basically the more walls the port shares with the box, the shorter it will be. So like a slot port is going to be shorter than the same dimension port that's just sticking out of the box or something. But if the port is really skinny or just small in general, the difference in lengths would be less. If you have like a 10 x 10 port and one is a slot and one is just poking out of the center of the box, it would be like 5 inches longer because it's not lengthened by the surrounding walls.
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Old 08-15-2015, 11:10 PM
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There are programs that take this into account for you or if you just do the non-slot port option, you can draw it out to be a slot port and accurately adjust the length.

So if a port is 2" x 10" slot, it will be one inch shorter length than a 2 x 10 non-slot port.
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Old 08-15-2015, 11:57 PM
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Think im starting to see what youre saying.
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